And that was the theme of his tweet in response to Klobuchar's announcement that she hopes to win the Democratic nomination to challenge him in 2020, as he made reference to the snowy conditions in Minneapolis during the Minnesota senator's event.

It wasn't long before Klobuchar responded, with a jibe about the president's hair.

ADVERTISEMENT

Thanks for watching!

ADVERTISEMENT

Thanks for watching!

Tackling climate change was one of the campaign promises that Klobuchar made during her announcement speech, pledging that on the first 100 days of her administration she would re-join the Paris Climate Agreement and re-instate the Obama-era Clean Power Act that was scrapped by the Trump administration.

She also pledged to reinstate gas mileage standards similarly abandoned by the president, and "put forth sweeping legislation to invest in green jobs and infrastructure."

Meanwhile, speaking after the ceremony on Boom Island, Klobuchar said that while Democratic rivals like Elizabeth Warren have been focusing their campaign events on Iowa – the first state to hold a presidential primary – she instead intends to head first to Wisconsin before going to Iowa.

"We’re starting in Wisconsin because as we remember, there wasn’t a lot of campaigning in Wisconsin in 2016," she said, making a not-so-subtle jibe at the expense of Hillary Clinton, who famously failed to visit the state she ultimately lost to President Trump by a tight margin.

The senator also responded to claims from former employees that she was at times abusive to her staff, which were reported by the Huffington Post and Buzzfeed this week.

"You know, I love our staff," she said, Politico reports. "And yes, I can be tough. And yes, I can push people. I know that. But in the end, there are so many great stories of our staff that have been with me for years who have gone on to do incredible things.

"I have, I'd say, high expectations for myself. I have high expectations for the people who work for me. But I have high expectations for this country, and that's what we need."